Principle and characteristics of self-priming fermentation tank

Self-aspirated fermenters operate on a unique principle where the agitator, designed with a central air intake, generates suction through its rotation. This eliminates the need for an external air compressor, reducing equipment costs.

The agitator, typically a hollow impeller, ejects liquid due to centrifugal force, creating a negative pressure that draws air into the tank. The incoming air is broken into tiny bubbles by the high-speed liquid flow, ensuring even dispersion. The air-liquid mixture is then guided into the fermentation liquid for thorough mixing.

**Advantages**:

- No need for an air compressor, reducing costs.

**Disadvantages**:

- The negative pressure air intake increases the risk of bacterial contamination.

- High agitation speeds can damage microbial hyphae, potentially hindering cell growth.